<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
    <script>
        console.log(this)

        var obj={
            text:function(){
                console.log(this);
            }
        }
        obj.text();

        function student(){
            this.name=name;
            console.log(this);
            this.study=function(){
                console.log('study');
            }
        }
        var stu=new student('tom');
        var stu1=new student('a');
    </script>
</body>
</html>